GRTgaz action : Purchase if the network' imbalance is due to a lack of gas. Purchase if the network' imbalance is due to an excess of gas.

GRTgaz' needs : Represents the balancing needs of GRTgaz.

Daily average price : Energy weighted average price of all the gas trades of title products in respect of a given gasday carried out on the trading platform managed by Powernext

Quantity transacted : Quantity of gas traded by GRTgaz with the market for balancing needs.

Marginal buying price : Maximum between the highest TSO buying intervention and the average price + 2.5%

Marginal selling price : Minimum between the lowest TSO selling intervention and the average price - 2.5%